A) \[p\vee (q\wedge r)\]
B) \[\tilde{\ }p\vee (q\wedge r)\]
C) \[\tilde{\ }p\wedge (q\wedge r)\]
D) \[p\vee (q\vee r)\]
Correct Answer: B
Solution :
[b]: \[\tilde{\ }(p\wedge (q\to \tilde{\ }r))\equiv \tilde{\ }(p\wedge (\tilde{\ }q\vee \tilde{\ }r))\] \[\equiv \,\tilde{\ }p\vee (q\wedge r)\]
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